Depending on architecture, perlasm differed on which one or both of:

  perl foo.pl flavor output.S
  perl foo.pl flavor > output.S

Upstream has now unified on the first form after making a number of
changes to their files (the second does not even work for their x86
files anymore). Sync those portions of our perlasm scripts with upstream
and update CMakeLists.txt and generate_build_files.py per the new
convention.

This imports various commits like this one:
184bc45f68 (this was done by taking a
diff, so I don't have the full list)

Confirmed that generate_build_files.py sees no change.

BUG=14

Change-Id: Id2fb5b8bc2a7369d077221b5df9a6947d41f50d2
Reviewed-on: https://boringssl-review.googlesource.com/8518
Reviewed-by: Adam Langley <agl@google.com>

(Imported from upstream's ec3a7c9b3729cd45c550222556100666aedc5bbc.)

Change-Id: I9f281fc03e6ece628d46344cf2c0850dd3bcd703
Reviewed-on: https://boringssl-review.googlesource.com/6343
Reviewed-by: Adam Langley <alangley@gmail.com>

(Imported from upstream's 7be6bc68c6baef87d4d730c2505a05810a5a1684.)

Change-Id: Ib0be641308d63679065d704553a5a979f058e81c
Reviewed-on: https://boringssl-review.googlesource.com/4492
Reviewed-by: Adam Langley <agl@google.com>

This addresses

- request for improvement for faster key setup in RT#3576;
- clearing registers and stack in RT#3554 (this is more of a gesture to
see if there will be some traction from compiler side);
- more commentary around input parameters handling and stack layout
(desired when RT#3553 was reviewed);
- minor size and single block performance optimization (was lying around);

(Imported from upstream's 23f6eec71d)

This one is best reviewed by verifying that
23f6eec71dbd472044db7dc854599f1de14a1f48^ in upstream has the exact same
versions of these files (we had no local diffs), so we can just copy them
wholesale.

bssl speed reports a wash on my Mac. If I keep running it, different ones win
each time.

Change-Id: I729bd39cf0b3a30cc24de839e1c734dcaef972b8
Reviewed-on: https://boringssl-review.googlesource.com/4491
Reviewed-by: Adam Langley <agl@google.com>

(Imported from upstream's 2d4d9623da)

Improve CBC decrypt and CTR by ~13/16%, which adds up to ~25/33%
improvement over "pre-Silvermont" version. [Add performance table to
aesni-x86.pl].

(Imported from upstream's b347341c75)

(Imported from upstream's 5572bc4e2f)

Initial fork from f2d678e6e8 (1.0.2 beta).

(This change contains substantial changes from the original and
effectively starts a new history.)